Under Slab Drainage Mat

New construction planning out the foundation and basement details i ve asked our builder to install drainage pipes under our basement slab 1000 sq ft and have them connect through the foundation to the footer drainage pipe.

Under slab drainage mat. But as the ground beneath the slab dries over time it will shrink and the slab will sink. The orientation of the tremdrain series drainage mat may change depending on whether the drainage is placed under the slab or on a mud slab. The drainage core is molded into durable ridges and bonded to a single layer of non woven filter fabric. If the under slab support is bad enough you can then get differential settlement across the crack that leaves a very unfortunate.

Sika drainage mat composites are available in both high flow dimpled core and high crush resistant geonet constructions. An extruded high density polyethylene drainage core with a non woven filter fabric bonded to the ridges of the geonet. Armordrain 400 drainage mats are designed to provide drainage in extreme cases involving heavy loads or heavy traffic such as under slabs planters retaining walls bridge abutments foundation walls and roof gardens. Underseal underslab membrane provides a continuous seal underneath the foundation slab.

Drainage mat is principally designed to reduce hydrostatic head pressure and direct water to a perforated drainage system. Had originally planned for a 4 inch layer of gravel topped. They perform a multi faceted role by providing protection for roofpro and sikalastic 320 ns sl membranes as well as a means of collecting and conveying excess water in plaza decks split slabs planters roof gardens and other roofing and waterproofing applications. Contact the site engineer of record and your local tremco sales.

A strong mechanical bond is developed between the membrane and concrete at the time of pouring as the concrete intermingles with the fibers of the nonwoven geotextile. Drainage mat grs 140 gal min sf 60 gal min sf 110 gal min sf 250 gal min sf astm d 4491 water retention drainage mat 420 drainage mat 720 drainage mat 1000 drainage mat grs 1 1 gal 10 sf product data sheet sika drainage mat september 2019 version 01 03 020816110010000003 2 3. Higher than current class a vapor barrier requirements 2200 grams or under 5. This system is designed for use over roof waterproofing membranes.

Drainage mat on compacted granular it must be compacted to a minimum 90 proctor. Builder says ok even though he considers this overkill but it ll cost us dearly in extra gravel. A protection course is a puncture resistant material designed to minimize or prevent possible damage to the waterproofing membrane prior to or during concrete pour and backfilling. The best way to counter this problem is first with good compaction then to not let them get wet by providing drainage.